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Dunlop positioned the MXR M87 Bass Compressor as a studio-grade compression pedal designed for bass guitar. It sat in the MXR effects line as a dedicated low-frequency dynamics tool, built around Constant Headroom Technology to maintain clean signal integrity under compression.
The M87 offered four selectable compression ratios — 4:1, 8:1, 12:1, and 20:1 — giving the player a range from gentle levelling through to hard limiting. Attack time ranged from 20 µs to 800 µs and release time from 50 ms to 1.1 s, allowing precise dynamic control. The unit's frequency response held within ±1 dB across 20 Hz to 20 kHz, a specification that accommodated the full bandwidth of a bass instrument. Input impedance was 1 MΩ and output impedance 600 Ω, with a maximum input level of +14 dBV and maximum output level of +8.5 dBV. The noise floor sat at -90 dBV. Switching was handled by true hardwire bypass. The pedal ran on a 9-volt DC power supply, drawing 14 mA with LEDs off and 19 mA with LEDs on.
Owners sourcing a replacement power supply should confirm the 9-volt DC centre-negative standard before purchasing; a qualified guitar technician can advise on internal servicing or calibration if the unit requires attention.
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